Book/Report

FZJ-2018-04313

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Superdeformation in $^{144, 145, 146}$Gd und Entwicklung eines gekapselten Ge-Detektors

Strähle, K. (Corresponding author)FZJ*

1993
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/19394

Report No.: Juel-2789

Abstract: The nuclei $^{144,145,146}$Gd have been populated at high spins using heavy ion reactions at the VICKSI accelerator of the Hahn-Meitner-Institut in Berlin. The $\gamma \gamma$-coincidences measured with the OSIRIS spectrometer have been analysed. The nucleus 146Gd has been populated using a $^{110}$Pd($^{40}$Ar,4n)$^{146}$ Gd reaction. In addition to the known superdeformed (SD) yrast band an excited SD band which has an intensity of $\approx$ 0,7% was found. Different from the yrast SD band, the constant dynamic moment of inertia $\Theta^{(2)} \approx$ 71,0$\hbar^{2}$/MeV of the excited SD band shows no indication of a band crossing. From a DSAM analysis the lifetimes of the SD states were determined and an average quadrupole moment for the excited SD band of Q$_{0}$ = 8 $\pm$ 2 eb was deduced. The nucleus can be described as a static rotor with an axis ratio of (c/a) = 1,41(10). High-spin states in $^{145}$Gd have been investigated through the $^{110}$Pd($^{40}$Ar,5n) reaction. Two SD bands have been established in this reaction. At least one of them can be assigned to the nucleus $^{145}$Gd. The high-spin states in $^{144}$Gd were populated using an $^{108}$Pd($^{40}$Ar,4n) reaction. In this reaction two SD bands were found. One of the bands belongs definitely to the nucleus $^{144}$Gd. An extended level scheme is proposed. A technique for producing encapsulated Ge detectors was developed and successfully used. This technique enabled us to produce the first hexagonal encapsulated detectors which will be used in the CLUSTER detectors. The encapsulation of Ge detectors is a key technology for any composite Ge-detector, on which the design of the 4$\pi $ $\gamma$-spectrometer EUROBALL is based on.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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